from flask import abort
from flask import current_app, jsonify
from flask import g

from flask import render_template
from flask import request
from flask import session

from info import db
from info.models import News, User, Comment, CommentLike
from info.utils.commons import user_login_data
from info.utils.response_code import RET
from . import news_blue

#功能描述：关注＆取消关注
# 请求路径: /news/followed_user
# 请求方式: POST
# 请求参数:user_id,action
# 返回值: errno, errmsg
@news_blue.route('/followed_user', methods=['POST'])
@user_login_data
def followed_user():

    #0.判断用户是否登陆
    if not g.user:
        return jsonify(errno=RET.NODATA,errmsg="用户未登录")
    #1.获取参数
    author_id = request.json.get("user_id")
    action = request.json.get("action")

    #2.参数校验，为空校验
    if not all([author_id,action]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数不全")

    #3.操作类型校验
    if not action in ["follow","unfollow"]:
        return jsonify(errno=RET.DATAERR,errmsg="操作类型有误")

    #4.根据作者id取出作者对象，判断作者对象是否存在
    try:
        author = User.query.get(author_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="获取用户失败")

    if not author:return jsonify(errno=RET.NODATA,errmsg="该作者不存在")
    #5.判断操作类型，添加对象属性
    try:
        if action == "follow":
            if not g.user in author.followers:
                author.followers.append(g.user)
        else:
            if g.user in author.followers:
                author.followers.remove(g.user)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="操作失败")

    #6.返回响应
    return jsonify(errno=RET.OK,errmsg="操作成功")


#功能描述：点赞＆取消点赞
@news_blue.route('/comment_like', methods=['POST'])
@user_login_data
def comment_like():
    if not g.user:
        return jsonify(errno=RET.NODATA,errmsg="用户未登录")

    # １.获取参数
    comment_id = request.json.get("comment_id")
    action = request.json.get("action")

    # 2.校验参数，为空校验
    if not all([comment_id,action]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数不全")
    # 3.操作类型校验
    if not action in ["add","remove"]:
        return jsonify(errno=RET.DATAERR,errmsg="操作类型有误")
    # 4.根据评论编号获取评论对象
    try:
        comment = Comment.query.get(comment_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="获取评论失败")

    if not comment: return jsonify(errno=RET.NODATA,errmsg="评论不存在")
    try:
        # 5.根据操作类型，点赞＆取消点赞
        if action == "add":
            #判断当前用户是否，对该评论点过赞
            comment_like = CommentLike.query.filter(CommentLike.user_id == g.user.id,CommentLike.comment_id == comment_id).first()
            if not comment_like:
                comment_like = CommentLike()
                comment_like.comment_id = comment_id
                comment_like.user_id = g.user.id

                db.session.add(comment_like)


            #点赞数量＋１
            comment.like_count += 1
        else:
            # 判断当前用户是否，对该评论点过赞
            comment_like = CommentLike.query.filter(CommentLike.user_id == g.user.id,
                                                   CommentLike.comment_id == comment_id).first()
            if comment_like:
                db.session.delete(comment_like)


            # 点赞数量-１
            if comment.like_count > 0:
                comment.like_count -= 1

            db.session.commit()
    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR,errmsg="操作失败")

    return jsonify(errno=RET.OK,errmsg="操作成功")

# 功能描述：评论＆回复评论
@news_blue.route('/news_comment', methods=['POST'])
@user_login_data
def news_comment():

    # 1.判断用户是否登陆
    if not g.user:
        return jsonify(errno=RET.NODATA,errmsg="用户未登录")

    # 2.获取参数
    news_id = request.json.get("news_id")
    content = request.json.get("comment")
    parent_id = request.json.get("parent_id")

    # 3.参数校验，为空校验
    if not all([news_id,content]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数不全")

    # 4.创建评论对象,设置属性
    try:
        comment = Comment()
        comment.user_id = g.user.id
        comment.news_id = news_id
        comment.content = content

    except Exception as e:
        current_app.logger.error(e)

    # 5.判断是否有父评论
    if parent_id:
        comment.parent_id = parent_id

    # 6.将评论保存到数据库中
    try:
        db.session.add(comment)
        db.session.commit()

    except Exception as e:
        current_app.logger.error(e)
        db.session.rollback()
        return jsonify(errno=RET.DBERR,errmsg="评论失败")
    # 7.返回响应，携带评论数据

    return jsonify(errno=RET.OK,errmsg="评论成功",data=comment.to_dict())



# 功能描述：收藏＆取消收藏
@news_blue.route('/news_collect', methods=['POST'])
@user_login_data
def news_collect():
    # user_id = session.get("user_id")
    # user = None
    # if user_id:
    #     try:
    #         user = User.query.get(user_id)
    #     except Exception as e:
    #         current_app.logger.error(e)

    if not g.user:
        return jsonify(errno=RET.NODATA,errmsg="该用户未登陆")

    # 1. 获取参数
    news_id = request.json.get("news_id")
    action = request.json.get("action")


    # 2. 校验参数，为空校验
    if not all([news_id,action]):
        return jsonify(errno=RET.PARAMERR,errmsg="参数不全")

    # 3. 操作类型校验
    if not action in ["collect","cancel_collect"]:
        return jsonify(errno=RET.DATAERR,errmsg="操作类型有误")

    # 4. 根据新闻编号，获取新闻对象
    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="获取新闻失败")

    # 5. 新闻对象是否存在
    if not news:
        return jsonify(errno=RET.NODATA,errmsg="新闻不存在")
    try:
        # 6. 根据操作类型,收藏&取消收藏操作
        if action == "collect":

            # 判断用户是否收藏过该新闻
            if not news in g.user.collection_news:
                g.user.collection_news.append(news)
        else:
            # 判断用户是否收藏过该新闻
            if news in g.user.collection_news:
                g.user.collection_news.remove(news)
    except Exception as e:
        return jsonify(errno=RET.DBERR,errmsg="操作失败")

    return jsonify(errno=RET.OK,errmsg="操作成功")

@news_blue.route('/<int:news_id>')
@user_login_data
def news_detail(news_id):
    # user_id = session.get("user_id")
    # user = None
    # if user_id:
    #     try:
    #         user = User.query.get(user_id)
    #     except Exception as e:
    #         current_app.logger.error(e)

    try:
        news = News.query.get(news_id)
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="获取新闻失败")

    if not news:
        abort(404)

    try:
        news_list = News.query.order_by(News.clicks.desc()).limit(5).all()
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="获取新闻失败")

    click_news_list = []
    for click_news in news_list:
        click_news_list.append(click_news.to_dict())

    #处理登陆用户是否对该新闻收藏过
    is_collected = False
    #用户需要登陆，新闻在用户的收藏列表中
    if g.user and news in g.user.collection_news:
        is_collected = True

    #查询新闻的所有评论
    try:
        comments = Comment.query.filter(Comment.news_id == news_id).order_by(Comment.create_time.desc()).all()
    except Exception as e:
        current_app.logger.error(e)
        return jsonify(errno=RET.DBERR,errmsg="获取评论失败")


    like_comment_ids = []
    if g.user:
        try:
            # 获取用户点赞过的评论编号
            comment_likes = CommentLike.query.filter(CommentLike.user_id == g.user.id).all()
        except Exception as e:
            current_app.logger.error(e)


        # 遍历获取用户，点赞过的评论编号
        for comment_like in comment_likes:
            like_comment_ids.append(comment_like.comment_id)

    comment_list = []
    for comment in comments:

        comment_dict = comment.to_dict()
        #假设用户对所有评论，都没有点赞
        comment_dict["is_like"] = False
        if g.user and comment.id in like_comment_ids:
            comment_dict["is_like"] = True
        comment_list.append(comment_dict)

    #判断该用户是否关注过该新闻的作者
    is_followed = False
    if g.user and news.user:
        if g.user in news.user.followers:
            is_followed = True

    data = {
        "news_info":news.to_dict(),
        "user_info":g.user.to_dict() if g.user else "",
        "click_news_list":click_news_list,
        "is_collected":is_collected,
        "comments":comment_list,
        "is_followed":is_followed
    }



    return render_template("news/detail.html",data=data)